KAL Callisto Pharmaceuticals,

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

_________________

SCHEDULE 13G

INFORMATION STATEMENT PURSUANT TO RULES 13D-1 AND 13D-2
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO.   ) ¹

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

      Rule 13d-1(b)

      Rule 13d-1(c)

      Rule 13d-1(d)

_________________

         ¹  The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes .)

CUSIP No. 1312EM104

13G

Page 2 of 5 Pages

1)	Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) RAB Special Situations (Master) Fund Limited

2)	Check the Appropriate Box if a Member of a Group (See Instructions) (a)   (b)

3)	SEC Use Only

4)	Citizenship or Place of Organization Cayman Islands

Number of Shares Beneficially Owned by Each Reporting Person With:	(5)	Sole Voting Power 12,008,533*
	(6)	Shared Voting Power 0
	(7)	Sole Dispositive Power 12,008,533*
	(8)	Shared Dispositive Power 0

9)

Aggregate Amount Beneficially Owned by Each Reporting Person 12,008,553* *The reporting person owns 708,293 shares of common stock of the issuer, 500,000 Series B Preferred shares, which may be converted into 1,000,000 common shares, and warrants exercisable to acquire an additional 10,300,240 shares of common stock. The Series B preferred shares warrants are not convertible into common shares if, as a result of a conversion or exercise, the holder would then become a “ten percent beneficial owner” of the issuer’s common stock, as defined in Rule 16a-2 under the Securities Exchange At of 1934.

10)	Check If the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [   ]

11)

Percent of Class Represented by Amount in Row (9) Up to 9.9999%** **The percentages used herein are calculated based upon 46,863,161 outstanding shares as of November 12, 2007, plus 11,300,240 common shares in aggregate underlying convertible securities which are beneficially owned by the reporting persons and included pursuant to Rule 13d-3(d)(1)(i) of the Act.

12)	Type of Reporting Person (See Instructions) CO

---

CUSIP No. 1312EM104

13G

Page 3 of 5 Pages

Item 1 (a)	Name of Issuer:
	Callisto Pharmaceuticals Inc.
Item 1 (b)	Address of Issuer’s Principal Executive Offices:
	420 Lexington Avenue, Suite 1009 New York, New York 10170
Item 2 (a)	Name of Person Filing: RAB Special Situations (Master) Fund Limited
Item 2 (b)	Address of Principal Business Office or, if none, Residence:
	RAB Special Situations (Master) Fund Limited P.O. Box 908 GT Walker House Mary Street George Town, Cayman Islands
Item 2 (c)	Citizenship: Cayman Islands
Item 2 (d)	Title of Class of Securities: Common Shares
Item 2 (e)	CUSIP Number:
	1312EM104

Item 3.	If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a:
	(a)		Broker or dealer registered under Section 15 of the Act.
	(b)		Bank as defined in Section 3(a)(6) of the Act.
	(c)		Insurance company as defined in Section 3(a)(19) of the Act.
	(d)		Investment company registered under Section 8 of the Investment Company Act.
	(e)		An investment adviser in accordance with Rule 13d-1(b)(1) (ii)(E);
	(f)		An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);
	(g)		A parent holding company, in accordance with Rule 13d-1(b)(ii)(G);
	(h)		A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;
	(i)		A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940;
	(j)		Group, in accordance with Rule 13d-1(b)(1)(ii)(J).
			If this statement is filed pursuant to Rule 13d-1(c), check this box.

---

CUSIP No. 1312EM104

13G

Page 4 of 5 Pages

Item 4.	Ownership.
	Provide the following information regarding the aggregate number and percentage of the class of securities identified in Item 1.

	(a)	Amount beneficially owned:
		See Item 9 on the cover page

	(b)	Percent of Class:
		See Item 11 on the cover page

(c)

Number of shares as to which such person has: (i)     Sole power to vote or to direct the vote:    (ii)    Shared power to vote or direct the vote:    (iii)   Sole power to dispose or to direct the disposition of:    (iv)    Sole power to dispose or to direct the disposition of:    See Items 5-8 on cover page

Item 5.	Ownership of Five Percent or Less of a Class.
	If the statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following
Item 6.	Ownership of More than Five Percent on Behalf of Another Person.
	N/A
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	N/A
Item 8.	Identification and Classification of Members of the Group. N/A

Item 9.

Notice of Dissolution of Group. N/A

---

CUSIP No. 1312EM104

13G

Page 5 of 5 Pages

Item 10.	Certification.
	By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

SIGNATURE

        After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

February 13, 2008                                                    (Date)

RAB Special Situations (Master) Fund Limited by Fraser McGee and Jake Leavesley Authorised signatories for RAB Capital plc for and on behalf of RAB Special Situations (Master) Fund Limited /s/ Fraser McGee                                   (Signature) /s/ Jake Leavesley                                 (Signature)

February 13, 2008                                                    (Date)

/s/   William Philip Seymour Richards       William Philip Seymour Richards

---

Callisto (AMEX:KAL)
Graphique Historique de l'Action
De Nov 2024 à Déc 2024

Callisto (AMEX:KAL)
Graphique Historique de l'Action
De Déc 2023 à Déc 2024