Exhibit (a)(1)(vii)

This announcement is not an offer to purchase or a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely by the Offer to Purchase dated June 27, 2007 and the related Letter of Transmittal and any amendments or supplements thereto. The Offer is not being made to, nor will tenders be accepted from or on behalf of, holders of Shares in any jurisdiction in which the making of the Offer or acceptance thereof would not be in compliance with the laws of such jurisdiction. In any jurisdiction where the applicable laws require the Offer to be made by a licensed broker or dealer, the Offer shall be deemed to be made on behalf of Purchaser (as defined below) by Greenhill & Co., LLC and Citigroup Global Markets Inc., the Dealer Managers for the Offer, or by one or more registered brokers or dealers licensed under the laws of such jurisdiction.

Notice of Offer to Purchase for Cash
All Outstanding Shares of Common Stock
(including the associated preferred stock purchase rights)
of
Ventana Medical Systems, Inc.
at
$75.00 Net per Share
by
Rocket Acquisition Corporation
an indirect wholly owned subsidiary of
Roche Holding Ltd

Rocket Acquisition Corporation (the “Purchaser”), a Delaware corporation and an indirect wholly owned subsidiary of Roche Holding Ltd, a joint stock company organized under the laws of Switzerland (“Parent”), is offering to purchase all outstanding shares of Common Stock, par value $0.001 per share (together with the associated preferred stock purchase rights, the “Shares”), of Ventana Medical Systems, Inc., a Delaware corporation (the “Company”), at $75.00 per Share, net to the seller in cash, without interest and less applicable withholding taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated June 27, 2007 (the “Offer to Purchase”) and in the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the “Offer”).

THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON THURSDAY, JULY 26, 2007, UNLESS THE OFFER IS EXTENDED.

The purpose of the Offer is to acquire control of, and the entire equity interest in, the Company. The Purchaser currently intends, as soon as practicable after consummation of the Offer, to seek maximum representation on the Company’s Board of Directors and to seek to have the Company consummate the proposed merger (the “Merger”) of the Company and the Purchaser (or one of the Purchaser’s subsidiaries) pursuant to which all outstanding Shares not owned by Parent or its subsidiaries (including the Purchaser) would be converted into the right to receive cash in an amount equal to the price per Share paid pursuant to the Offer.

The Offer is conditioned upon, among other things, (i) there being validly tendered and not withdrawn before the expiration of the Offer a number of Shares, which, together with the shares then owned by the Parent and its subsidiaries (including the Purchaser), represents at least a majority of the total number of Shares outstanding on a fully diluted basis, (ii) the Board of Directors of the Company redeeming the associated preferred stock purchase rights or the Purchaser being satisfied, in its reasonable discretion, that the rights have been invalidated or are otherwise inapplicable to the Offer and the Merger, (iii) the Purchaser being satisfied, in its reasonable discretion,

that Section 203 of the Delaware General Corporation Law is inapplicable to the Merger, (iv) the Purchaser being satisfied, in its reasonable discretion, that the Arizona Control Share Act (as defined in the Offer to Purchase) is inapplicable to the Shares previously acquired by Parent and its subsidiaries and the shares to be acquired by the Purchaser pursuant to the Offer and (v) the Purchaser being satisfied, in its reasonable discretion, that the Arizona Business Combination Act (as defined in the Offer to Purchase) is inapplicable to the Merger. The Offer is not conditioned upon any financing arrangements or subject to a financing condition. Other conditions to the Offer are described in the Offer to Purchase. If any condition to the Offer is not satisfied, the Purchaser may (i) terminate the Offer and return all tendered Shares to tendering stockholders, (ii) extend the Offer and, subject to withdrawal rights as set forth below, retain all such Shares until the expiration of the Offer as so extended, (iii) waive such condition and, subject to any requirement to extend the period of time during which the Offer is open, purchase all Shares validly tendered prior to the Expiration Date (as defined in the Offer to Purchase) and not withdrawn or (iv) delay acceptance for payment of or payment for Shares, subject to applicable law, until satisfaction or waiver of the unsatisfied conditions to the Offer.

The Purchaser reserves the right, in its sole discretion, at any time and from time to time, to extend the period during which the Offer is open by giving oral or written notice of the extension to the Depositary and by making a public announcement of the extension.

After the expiration of the Offer, if all of the conditions to the Offer have been satisfied or waived but not all of the Shares have been tendered, the Purchaser may, subject to certain conditions, give stockholders a further opportunity to tender at the same price in one or more subsequent offering periods. The Purchaser does not currently intend to include a subsequent offering period, although it reserves the right to do so.

For purposes of the Offer, the Purchaser shall be deemed to have accepted for payment tendered Shares when, as and if the Purchaser give oral or written notice of its acceptance to the Depositary. In order to tender shares in the Offer, certificates for such Shares (or of a confirmation of a book-entry transfer of such Shares into the Depositary’s account at the Book-Entry Transfer Facility (as defined in the Offer to Purchase)), a properly completed and duly executed Letter of Transmittal (or a manually signed facsimile thereof) and any other required documents must be timely received by the Depositary.

Stockholders can withdraw some or all of the Shares that they previously tendered in the Offer at any time prior to the expiration of the offer. Shares may also be withdrawn after August 25, 2007 unless theretofore accepted for payment as provided in the Offer to Purchase. Once we accept your tendered shares for payment upon expiration of the Offer, however, you will no longer be able to withdraw them. For your withdrawal to be effective, a written, telegraphic or facsimile transmission notice of withdrawal with respect to the Shares must be timely received by the Depositary at one of its addresses set forth on the back cover of the Offer to Purchase, and the notice of withdrawal must specify the name of the person who tendered the Shares to be withdrawn, the number of Shares to be withdrawn and the name of the registered holder of Shares, if different from that of the person who tendered such Shares. If the Shares to be withdrawn have been delivered to the Depositary, a signed notice of withdrawal with (except in the case of Shares tendered by an Eligible Institution (as defined in the Offer to Purchase)) signatures guaranteed by an Eligible Institution must be submitted before the release of such Shares. In addition, such notice must specify, in the case of Shares tendered by delivery of certificates, the serial numbers shown on the specific certificates evidencing the Shares to be withdrawn or, in the case of Shares tendered by book-entry transfer, the name and number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares.

In general, the sale of shares pursuant to the Offer will be a taxable transaction for U.S. federal income tax purposes and may also be a taxable transaction under applicable state, local or foreign income or other tax laws. All stockholders should consult their own tax advisor about the tax consequences to them of participating in the Offer in light of their particular circumstances.

The information required to be disclosed by paragraph (d)(1) of Rule 14d-6 of the General Rules and Regulations under the Securities Exchange Act of 1934 is contained in the Offer to Purchase and is incorporated herein by reference.

A request has been made to the Company for its stockholders list and security position listings for the purpose of disseminating the Offer to holders of Shares. The Offer to Purchase, the related Letter of Transmittal and other related documents will be mailed to record holders of Shares and to brokers, banks, and similar persons whose name appears or

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whose nominee appears on the stockholder list or, if applicable, who are listed as participants in a clearing agency’s security position listing for subsequent transmittal to beneficial owners of Shares.

The Offer to Purchase and the related Letter of Transmittal contain important information, which should be carefully read before any decision is made with respect to the Offer.

Requests for copies of the Offer to Purchase and Letter of Transmittal and other tender offer materials may be directed to the Information Agent or the Dealer Managers as set forth below, and copies will be furnished promptly at the Purchaser’s expense.

The Information Agent for the Offer is:

105 Madison Avenue

New York, New York 10016

(212) 929-5500 (Call Collect)

or

Call Toll-Free (800) 322-2885

Email: Ventana@mackenziepartners.com

The Dealer Managers for the Offer are:

Greenhill & Co., LLC	Citigroup Global Markets Inc.
300 Park Avenue	388 Greenwich Street
New York, New York 10022	New York, New York 10013
Call Toll Free: (888) 504-7336	Call Toll Free: (866) 362-5840

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